Răspuns :
Regula de 3 simpla.
5 robinete........ 10 ore
2 robinete........ y ore
5 : 2 = 10 : y
5y = 10x2
5y = 20
y = 20:5
y = 4 ore
Bazinul se va umple in 4 ore.
5 robinete.....10 ore
2 robinete.....x ore
[tex]x = \frac{5 \times 10}{2} = \frac{50}{2} = 25 \: ore[/tex]
2 robinete.....x ore
[tex]x = \frac{5 \times 10}{2} = \frac{50}{2} = 25 \: ore[/tex]